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Engine coolant fill and bleed

forty3 Jun 12, 2018

  1. forty3

    forty3 Active Member

    I've separated the engine and supercharger cooling systems on the my S4 and now need to bleed the main engine coolant loop.

    I lost a lot of coolant as a result of a damaged supercharger heat exchanger so there is plenty of air in the system.

    All the guides I've seen use a vacuum filler for the coolant but I don't have access to one so was wondering if anyone knew how to do a fill and bleed without it?

    As the supercharger cooling system has been seperated I am unable to use the supercharger bleed ports.

    Thanks in advance
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  3. Mario

    Mario Active Member TDi Audi A4 quattro S-line owners group S tronic Manual

    It's no different than any other engine really, but Audi recommend use of a vacuum bleeding tool as it removes the majority of air during the initial fill up of the engine, then there is minimal air left to bleed after.

    However you can still do it without a vacuum bleeder. Just fill up with coolant very slowly to minimise trapped air in the system and then once filled follow the normal bleed process as per the manual.
    forty3 likes this.

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